package com.azunitech.apm.sensors.location;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;

public class GPSTracker  {
	private static final Logger log = LoggerFactory.getLogger(GPSTracker.class);	 
    private final Context mContext;
 
    // flag for GPS status
    boolean isGPSEnabled = false;
 
    // flag for network status
    boolean isNetworkEnabled = false;
 
    // flag for GPS status
    boolean canGetLocation = false;
 
    Location location; // location
    double latitude; // latitude
    double longitude; // longitude
    
    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
 
    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
 
    // Declaring a Location Manager
    protected LocationManager locationManager;
 
    protected LocationListener m_LocationListener = new MyLocationListener();;
    
    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }
 
    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
 
            // getting GPS status
            isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
 
            // getting network status
            isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
 
            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } 
            else {
                this.canGetLocation = true;
                // First get location from Network Provider
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, m_LocationListener);
                    log.debug("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, m_LocationListener);
                        log.debug("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }
        } 
        catch (Exception e) {
            log.warn(e.getMessage(), e);
        }
        return location;
    }
     
    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this.m_LocationListener);
        }      
    }
     
    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }
        // return latitude
        return latitude;
    }
     
    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }
         
        // return longitude
        return longitude;
    }
     
    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }
    
    private class MyLocationListener implements LocationListener{
	 
	    public void onLocationChanged(Location location) {
	    }
	 
	    public void onProviderDisabled(String provider) {
	    }
	 
	    public void onProviderEnabled(String provider) {
	    }
	 
	    public void onStatusChanged(String provider, int status, Bundle extras) {
	    }
    }
}